LONDON, ENGLAND – MARCH 08: A rare iceberg painting by the world’s top-selling living painter Gerhard Richter sold for £17.7 million ($21.6 million) at Sotheby’s on March 8, 2017 in London, England. The Contemporary Art evening sale saw the tally for art sold across auction houses in London reach over half a billion pounds in just seven days. (Photo by Tristan Fewings/Getty Images for Sotheby’s)